This chapter is the last lecture on design patterns. It will talk about the third design pattern-behavioral pattern, with a total of 11 types: policy pattern, template method pattern, observer pattern, iterative sub-pattern, responsibility chain pattern, command pattern, memo pattern, state pattern, visitor pattern, intermediary pattern and interpreter pattern. I have been writing about design patterns for a long time. At last it's halfway through, Writing a blog post is a very time-consuming thing, Because I have to be responsible for the readers, Whether it's graphs, codes, or representations, Everyone hopes to write it as clearly as possible so that readers can understand it. I think both I and the readers hope to see high-quality blog posts come out. Starting from myself, I will stick to it and update it continuously. The continuous motivation comes from the continuous support of readers and friends. I will do my best to write every article well! I hope everyone can give opinions and suggestions continuously and jointly create a perfect blog post!
The fundamental reason for using design patterns is to adapt to changes, improve code reuse rate, and make software more maintainable and scalable. In addition, the following principles should be followed when designing: single responsibility principle, open and closed principle, Richter substitution principle, dependency inversion principle, interface isolation principle, composite reuse principle and Dimit principle. Each design principle is described below.
不堪同学欺凌而自杀的少女，被心怀妒忌的同事残害身心的上班族，突遭不明身份的人捣乱店面的店主，被高利贷布下陷阱害得家破人亡的少年……这些不幸的人们在一筹莫展时均遇到了一位神秘的“怨屋”（木下あゆ美饰），承诺会用完美的手法为他们复仇，“寻人、社会性抹杀、甚至杀人都可以”，事后则要收取高额报酬，同时要求他们在任何情形下都不能说出自己的事。
2016年，一場婚宴正在舉行，而實際上是一場36歲的高中同學會…
E level of economic development;
究竟要如何将自己的祖国导向和平？
Lazy loading, asynchronous and parallel processing
半年之内，若再不去抢，他们就要自己去了。
让我再想一想。
讲述的是住在两隔壁的两个冤家，从noon搬进来第一天两人就打打闹闹，最后却相爱了的故事。
她刚才已经准备好了，就算陈启找来一个易拉罐拉环给她戴上，她也会答应。
张老太太哼了一声，道：说得自己跟谁似的，这家少了你都不成。
夜晚，被荠迷住的小光向她请求。
若是与蒙古名将交锋，我军必会防这一手，怎料贼寇竟有如此用兵之人，防不胜防啊……元敬对此贼评价如此之高？杭州已失，此贼自是不可小觑。
他笑嘻嘻地上前，对墨鲫道：是我叫你。
1966年秋天，越南战争期间，在日本国内的美国空军横田基地内，不时可见F4幻影战斗机频繁起降，空气中充斥着一股杀戮的气氛；就在此时，基地附近的市区连续发生了离奇的命案。 地下铁，银座线，正驶著通往浅草的最后一班列车，一名少女出现在空荡的车厢内，她拥有令大人感到刺眼的眼神，紧闭着双存欲诉说她内心的真正意念，她的名字叫小夜(SAYA)；她是“组织”为了打倒潜伏于人类社会里的吸血鬼“翼手”，因而派遣至人类社会的救世主。 穿着水手服的小夜，手持日本武士刀作为武器，潜入了基地内的美国学校。一柄冷血无情的武士刀，是她消除邪魔、保护人类的武器。而她身体里这一半的人性，可能就是她打败敌人的秘诀…
小声道：我大哥说，朝廷要扩建水军。
充满了冲突的校园生活就此拉开序幕，想要解决问题的赵强子自己却成为了最大的问题。在这里，赵强子需要面对的不仅仅是来自学生们的非议和压力，更在无意之中发现了学校财团那不可告人的秘密
(4) There are more than 10 registered fire engineers, including at least 6 first-class registered fire engineers;
